Length subtracting

Express in mm: 5 3/10 cm - 2/5 mm

Correct result:

x =  52.6 mm

Solution:

x1=cm2mm(5+3/10)=53 x2=2/5=25=0.4 mm  x=x1−x2=53−0.4=2635=2635 mm=52.6 mm

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